The inspection methods and detection standards of electric wrench

Electric wrench has many applications in life. Today, Xiaobian will share with you the inspection methods and detection standards of electric wrench, hoping to bring you help.

I. Appearance inspection

Check the overall appearance of the product. Parts should be assembled in place, no missing or dislocation, no loose solid parts. Impact wrench shell surface has no scratches, no color difference, no extrusion deformation, no obvious dislocation, no burr.

2. Measure no-load current and no-load speed

The impact wrench runs at the rated voltage for 15min under the two conditions of forward rotation and reverse rotation respectively. After reading Q/ CXJ03-16-2001, the no-load input power is taken.

Three, reversing spark test

After 15min of no-load operation at the rated voltage, the spark under the brush shall not be greater than the level 2 specified in GB/T755.

Four, switch off inspection

Switch on the power at the rated voltage of each impact wrench, positive and reverse on and off 5 times, observe whether the normal on and off, whether there is a stuck phenomenon.

V. Sound test

In the process of no-load operation, monitor the sound of the product, the operation sound should be uniform and harmonious, no abnormal noise.

Vi. Vibration inspection

In the process of no-load operation, the product is held in the hand, and the vibration is smooth and uniform, without obvious hand numbness.

Seven, voltage resistance test

A frequency of 50HZ was applied between the contact pin of the power plug of the product and the output shaft of the product, and the actual sine wave voltage was 4000V. No breakdown and flashover occurred for 3s, and the breakdown current of voltage resistance was set at 5mA.

Eight, observe whether there are other abnormal problems

9. Test conditions

When the impact wrench is tested, the power supply voltage should be within the range of ±10% of the rated product voltage.

X. Test records

Ex factory tests should be recorded, at least the following:

1. Appearance inspection results;

2, no-load current value;

3. No-load speed value (spot check 1%);

4. Noise inspection results;

5. Vibration inspection results;

6. Check result of reversing spark;

7. Voltage resistance test results.

8. Wipe iron.

9. Check the on-off switch.

10. Other abnormal phenomena.

Among them, no-load current and no-load speed should record the measured data, while other items can only be qualified or not.

Note: The symbol "√" can be used to indicate qualified, and the symbol "×" to indicate unqualified. The products that fail the test should be returned for readjust assembly. After the assembly is completed, they should be sent to the test. The repaired products should be inspected again. The qualified products shall be delivered to the packing factory after the inspector issues the certificate of qualification.

Item of Inspection

The inspection items and test requirements shall be carried out according to the above requirements, and the rest shall be carried out according to the following requirements.

Inspection of packing

a) The surface of the impact wrench is clean and free of oil stains. The packing documents and accessories are complete, and the nameplate and label are firmly pasted, smooth and wrinkle-free. The name, specification and model are consistent with the product.

b) The inner and outer packing boxes are clean and legible. The packing belt is firm and neat, and the identification code is correct.

Sampling scheme according to GB2828 one-time sampling scheme: normal inspection level S-4 sampling.